Abstract: The freeze-thaw heave and thaw settlement of seasonal frozen soil can loosen the foundation and damage bridge foundations. With the gradual advancement of the preliminary geological survey work for the railway, the distribution of frozen soil along the railway corridor has become an engineering geological issue that cannot be ignored. To investigate the types of frozen soil, its distribution, and frozen soil settlement around Pengqu River in Dingri County, the researchers in this paper used a combination of Interferometric Synthetic Aperture Radar (InSAR) technology and integrated geophysical methods to conduct field measurements and interpret the frozen soil conditions in the area, followed by drilling verification. The research results indicated that the frozen soil in the study area was seasonal, mainly distributed on both sides of Pengqu River and the south of Gangga Town. The thickness of the frozen soil layer was generally 0.4~0.6 m, with a maximum not exceeding 1 m. The settlement was significant in localized areas, especially in the southern part of Gangga Town and near Chazi Village, with a maximum settlement rate of 14.83 mm/a. The combined application of multiple methods could effectively identify the distribution and settlement characteristics of frozen soil, providing scientific basis for site selection and construction of plateau railway projects.